diff --git a/src/bin/common_post.cc b/src/bin/common_post.cc
index 0df6b0108..6c14f5373 100644
--- a/src/bin/common_post.cc
+++ b/src/bin/common_post.cc
@@ -74,7 +74,7 @@ static const argp_option options_disabled[] =
     /**************************************************/
     { nullptr, 0, nullptr, 0, "Output automaton type:", 2 },
     { "generic", OPT_GENERIC, nullptr, 0,
-      "Any acceptance is allowed (default)", 0 },
+      "any acceptance is allowed (default)", 0 },
     { "tgba", OPT_TGBA, nullptr, 0,
       "Transition-based Generalized Büchi Automaton", 0 },
     { "ba", 'B', nullptr, 0,